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~x + ~y == ~(x + y) is always false?

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Is there a standard sign function (signum, sgn) in C/C++?

I want a function that returns -1 for negative numbers and +1 for positive numbers. http://en.wikipedia.org/wiki/Sign_function It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere. ...
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Gray out image with CSS?

... | edited Mar 22 '13 at 9:35 Taz 3,39722 gold badges3131 silver badges5252 bronze badges answere...
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How to convert 1 to true or 0 to false upon model fetch

...th true or false into a boolean/tinyint field in the database, which uses 1 or 0 . 4 Answers ...
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What is the difference between ~> and >= when specifying rubygem in Gemfile?

... 166 That's a pessimistic version constraint. RubyGems will increment the last digit in the version...
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App Inventor 2 计步传感器与距离测量教程 · App Inventor 2 中文网

... 界面设计 核心积木块 常见问题 Q1: 计步传感器distance是什么单位? Q2: 加速度计计步不准确? Q3: GPS轨迹记录耗电? 总结 « 返回首页 概述 App Inventor 2可以通过以下方...
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C# Thread safe fast(est) counter

... answered Nov 1 '12 at 16:50 Austin SalonenAustin Salonen 44.8k1515 gold badges100100 silver badges134134 bronze badges ...
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Is there a simple way to remove multiple spaces in a string?

... | edited Jan 4 '19 at 14:59 Francisco Couzo 8,04633 gold badges2929 silver badges3737 bronze badges ...
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Is there a way to detect if an image is blurry?

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Javascript roundoff number to nearest 0.5

...ng to screen resolution and for that i can only assign font size in pts to 1, 1.5 or 2 and onwards etc. 7 Answers ...